Vulnerability-Lookup

CVE-2026-39401 (GCVE-0-2026-39401)

Vulnerability from cvelistv5 – Published: 2026-04-07 20:24 – Updated: 2026-04-08 16:14

Title

Privilege Escalation via update_event Job Output in Cronicle

Summary

Cronicle is a multi-server task scheduler and runner, with a web based front-end UI. Prior to 0.9.111, jb child processes can include an update_event key in their JSON output. The server applies this directly to the parent event's stored configuration without any authorization check. A low-privilege user who can create and run events can modify any event property, including webhook URLs and notification emails. This vulnerability is fixed in 0.9.111.

Severity

5.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-08 16:11 UTC

CWE

CWE-862 - Missing Authorization

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/jhuckaby/Cronicle/security/adv…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
jhuckaby	Cronicle	Affected: < 0.9.111	guessed

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-39401",
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FKIE_CVE-2026-39401

Vulnerability from fkie_nvd - Published: 2026-04-07 21:17 - Updated: 2026-07-20 20:10

Severity

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/jhuckaby/Cronicle/security/advisories/GHSA-5j3v-cq96-xw6v	Exploit, Vendor Advisory
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/jhuckaby/Cronicle/security/advisories/GHSA-5j3v-cq96-xw6v	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	cronicle	cronicle	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Cronicle",
          "vendor": "jhuckaby",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.9.111"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:cronicle:cronicle:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "0.9.111",
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          "negate": false,
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    },
    {
      "lang": "es",
      "value": "Cronicle es un programador y ejecutor de tareas multi-servidor, con una interfaz de usuario de front-end basada en web. Antes de la versi\u00f3n 0.9.111, los procesos hijo jb pueden incluir una clave update_event en su salida JSON. El servidor aplica esto directamente a la configuraci\u00f3n almacenada del evento padre sin ninguna comprobaci\u00f3n de autorizaci\u00f3n. Un usuario con pocos privilegios que puede crear y ejecutar eventos puede modificar cualquier propiedad del evento, incluyendo URLs de webhook y correos electr\u00f3nicos de notificaci\u00f3n. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 0.9.111."
    }
  ],
  "id": "CVE-2026-39401",
  "lastModified": "2026-07-20T20:10:00.110",
  "metrics": {
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      {
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          "attackComplexity": "LOW",
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          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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        "source": "nvd@nist.gov",
        "type": "Primary"
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          "availabilityRequirement": "NOT_DEFINED",
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          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
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    "ssvcV203": [
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    }
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    {
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        {
          "lang": "en",
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        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.